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Related Experiment Video

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

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Published on: January 28, 2019

Suppression of the zero-order diffracted beam from a pixelated spatial light modulator by phase compression.

Jinyang Liang1, Sih-Ying Wu, Fredrik K Fatemi

  • 1Electrical and Computer Engineering Department, University of Texas at Austin, Austin, Texas 78712, USA. jinyang.liang@mail.utexas.edu

Applied Optics
|June 15, 2012
PubMed
Summary

A novel phase compression technique effectively suppresses the unwanted on-axis zero-order diffracted beam from spatial light modulators (SLMs). This method significantly reduces the zero-order beam by a factor of 3 with minimal impact on image quality.

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Area of Science:

  • Optics and Photonics
  • Information Displays

Background:

  • Pixelated spatial light modulators (SLMs) often suffer from an undesirable on-axis zero-order diffracted (ZOD) beam.
  • This ZOD beam can interfere with desired diffraction orders, impacting image quality and system performance.

Purpose of the Study:

  • To introduce and validate a simple method for suppressing the ZOD beam from phase-only SLMs.
  • To analyze the trade-offs between ZOD suppression and image quality/diffraction efficiency.

Main Methods:

  • A phase compression technique was applied to computer-generated holograms (CGHs) loaded onto SLMs.
  • The phase of each SLM element was scaled and rotated to create a destructive interference beam for the ZOD.
  • Experiments were conducted using two liquid-crystal SLMs, and numerical simulations were performed.

Main Results:

  • A factor of 3 reduction in the ZOD beam intensity was experimentally achieved.
  • Numerical simulations demonstrated that phase compression leads to negligible image degradation.
  • The study found minimal power loss associated with the phase compression method.

Conclusions:

  • Phase compression is a viable and simple technique for effectively suppressing the ZOD beam in phase-only SLMs.
  • This method offers a practical solution for improving the performance of SLM-based optical systems.
  • The technique shows promise for applications requiring high-quality beam control and reduced unwanted diffraction.